LoCoMo has some special handling for TFT screens attached to Collie and Poodle. Implement that as a separate driver.
Signed-off-by: Dmitry Eremin-Solenikov <[email protected]> --- drivers/video/backlight/Kconfig | 10 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/locomo_lcd.c | 285 +++++++++++++++++++++++++++++++++++ 3 files changed, 296 insertions(+) create mode 100644 drivers/video/backlight/locomo_lcd.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 6c093e2..b2f995c 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -48,6 +48,16 @@ config LCD_LMS283GF05 SPI driver for Samsung LMS283GF05. This provides basic support for powering the LCD up/down through a sysfs interface. +config LCD_LOCOMO + tristate "Sharp LOCOMO LCD Driver" + depends on MFD_LOCOMO + select IIO + help + If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to + enable the LCD driver. The panel starts up in power + off state, so you need this driver in order to see any + output. + config LCD_LTV350QV tristate "Samsung LTV350QV LCD Panel" depends on SPI_MASTER diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 2de73d2..686cf1a 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_LCD_L4F00242T03) += l4f00242t03.o obj-$(CONFIG_LCD_LD9040) += ld9040.o obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o obj-$(CONFIG_LCD_LMS501KF03) += lms501kf03.o +obj-$(CONFIG_LCD_LOCOMO) += locomo_lcd.o obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o obj-$(CONFIG_LCD_S6E63M0) += s6e63m0.o diff --git a/drivers/video/backlight/locomo_lcd.c b/drivers/video/backlight/locomo_lcd.c new file mode 100644 index 0000000..dc316cb --- /dev/null +++ b/drivers/video/backlight/locomo_lcd.c @@ -0,0 +1,285 @@ +/* + * Backlight control code for Sharp Zaurus SL-5500 + * + * Copyright 2005 John Lenz <[email protected]> + * Maintainer: Pavel Machek <[email protected]> (unless John wants to :-) + * GPL v2 + * + * This driver assumes single CPU. That's okay, because collie is + * slightly old hardware, and no one is going to retrofit second CPU to + * old PDA. + */ + +#include <linux/delay.h> +#include <linux/fb.h> +#include <linux/gpio/consumer.h> +#include <linux/iio/consumer.h> +#include <linux/lcd.h> +#include <linux/mfd/locomo.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +struct locomo_lcd { + struct regmap *regmap; + struct platform_device *dev; + struct locomo_lcd_platform_data *data; + int power; + struct iio_channel *comadj; + struct gpio_desc *vsha, *vshd, *vee, *mod; +}; + +static void locomo_lcd_on(struct locomo_lcd *lcd) +{ + gpiod_set_value(lcd->vsha, 1); + usleep_range(2000, 3000); + + gpiod_set_value(lcd->vshd, 1); + usleep_range(2000, 3000); + + iio_write_channel_raw(lcd->comadj, lcd->data->comadj); + usleep_range(5000, 6000); + + gpiod_set_value(lcd->vee, 1); + usleep_range(10000, 11000); + + /* TFTCRST | CPSOUT=0 | CPSEN */ + regmap_write(lcd->regmap, LOCOMO_TC, 0x01); + + /* Set CPSD */ + regmap_write(lcd->regmap, LOCOMO_CPSD, 6); + + /* TFTCRST | CPSOUT=0 | CPSEN */ + regmap_write(lcd->regmap, LOCOMO_TC, 0x04 | 0x01); + usleep_range(10000, 11000); + + gpiod_set_value(lcd->mod, 1); +} + +static void locomo_lcd_off(struct locomo_lcd *lcd) +{ + /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */ + regmap_write(lcd->regmap, LOCOMO_TC, 0x06); + usleep_range(1000, 2000); + + gpiod_set_value(lcd->vsha, 0); + msleep(110); + + gpiod_set_value(lcd->vee, 0); + msleep(700); + + iio_write_channel_raw(lcd->comadj, 0); + usleep_range(5000, 6000); + + /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */ + regmap_write(lcd->regmap, LOCOMO_TC, 0); + gpiod_set_value(lcd->mod, 0); + gpiod_set_value(lcd->vshd, 0); +} + +static void locomo_lcd_program_adsync(struct locomo_lcd *lcd) +{ + regmap_write(lcd->regmap, LOCOMO_ASD, + 6 + 8 + 320 + 30 - 10); + regmap_update_bits(lcd->regmap, LOCOMO_ASD, + 0x8000, + 0x8000); + + regmap_write(lcd->regmap, LOCOMO_HSD, + 6 + 8 + 320 + 30 - 10 - 128 + 4); + regmap_update_bits(lcd->regmap, LOCOMO_HSD, + 0x8000, + 0x8000); + + regmap_write(lcd->regmap, LOCOMO_HSC, 128 / 8); + + /* XON */ + regmap_write(lcd->regmap, LOCOMO_TADC, 0x80); + usleep_range(1000, 1100); + + /* CLK9MEN */ + regmap_update_bits(lcd->regmap, LOCOMO_TADC, + 0x10, + 0x10); + usleep_range(100, 200); +} + +static void locomo_lcd_disable_adsync(struct locomo_lcd *lcd) +{ + /* ADSTART */ + regmap_write(lcd->regmap, LOCOMO_ASD, 0x00); + + /* 18MHz clock off*/ + regmap_write(lcd->regmap, LOCOMO_TADC, 0x00); +} + +int locomo_lcd_set_power(struct lcd_device *ldev, int power) +{ + struct locomo_lcd *lcd = lcd_get_data(ldev); + + dev_dbg(&ldev->dev, "LCD power %d (is %d)\n", power, lcd->power); + + if (!power && lcd->power) + locomo_lcd_on(lcd); + + if (power && !lcd->power) + locomo_lcd_off(lcd); + + lcd->power = power; + + return 0; +} + +static int locomo_lcd_get_power(struct lcd_device *ldev) +{ + struct locomo_lcd *lcd = lcd_get_data(ldev); + + return lcd->power; +} + +static struct lcd_ops locomo_lcd_ops = { + .set_power = locomo_lcd_set_power, + .get_power = locomo_lcd_get_power, +}; + +#ifdef CONFIG_PM_SLEEP +static int locomo_lcd_suspend(struct device *dev) +{ + struct lcd_device *ldev = dev_get_drvdata(dev); + struct locomo_lcd *lcd = lcd_get_data(ldev); + + locomo_lcd_off(lcd); + + locomo_lcd_disable_adsync(lcd); + + return 0; +} + +static int locomo_lcd_resume(struct device *dev) +{ + struct lcd_device *ldev = dev_get_drvdata(dev); + struct locomo_lcd *lcd = lcd_get_data(ldev); + + locomo_lcd_program_adsync(lcd); + + if (!lcd->power) + locomo_lcd_on(lcd); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(locomo_lcd_pm, locomo_lcd_suspend, locomo_lcd_resume); +#define LOCOMOLCD_PM (&locomo_lcd_pm) +#else +#define LOCOMOLCD_PM NULL +#endif + +static int locomo_lcd_probe(struct platform_device *dev) +{ + struct lcd_device *lcd_dev; + struct locomo_lcd *lcd; + int rc; + + lcd = devm_kmalloc(&dev->dev, sizeof(struct locomo_lcd), GFP_KERNEL); + if (!lcd) + return -ENOMEM; + + lcd->dev = dev; + lcd->power = FB_BLANK_NORMAL; + + lcd->regmap = dev_get_regmap(dev->dev.parent, NULL); + if (!lcd->regmap) + return -ENODEV; + + lcd->data = dev_get_platdata(&dev->dev); + if (!lcd->data) + return -EINVAL; + + lcd->vsha = devm_gpiod_get(&dev->dev, "VSHA", GPIOD_OUT_LOW); + if (IS_ERR(lcd->vsha)) + return PTR_ERR(lcd->vsha); + + lcd->vshd = devm_gpiod_get(&dev->dev, "VSHD", GPIOD_OUT_LOW); + if (IS_ERR(lcd->vshd)) + return PTR_ERR(lcd->vshd); + + lcd->vee = devm_gpiod_get(&dev->dev, "Vee", GPIOD_OUT_LOW); + if (IS_ERR(lcd->vee)) + return PTR_ERR(lcd->vee); + + lcd->mod = devm_gpiod_get(&dev->dev, "MOD", GPIOD_OUT_LOW); + if (IS_ERR(lcd->mod)) + return PTR_ERR(lcd->mod); + + lcd->comadj = iio_channel_get(&dev->dev, "comadj"); + if (IS_ERR(lcd->comadj)) { + rc = PTR_ERR(lcd->comadj); + if (rc == -ENODEV) + rc = -EPROBE_DEFER; + + return rc; + } + + locomo_lcd_program_adsync(lcd); + + lcd_dev = devm_lcd_device_register(&dev->dev, "locomo", &dev->dev, lcd, + &locomo_lcd_ops); + if (IS_ERR(lcd_dev)) { + rc = PTR_ERR(lcd_dev); + goto err; + } + + platform_set_drvdata(dev, lcd_dev); + + lcd_set_power(lcd_dev, FB_BLANK_UNBLANK); + + return 0; + +err: + locomo_lcd_disable_adsync(lcd); + iio_channel_release(lcd->comadj); + + return rc; +} + +static int locomo_lcd_remove(struct platform_device *dev) +{ + struct lcd_device *ldev = platform_get_drvdata(dev); + struct locomo_lcd *lcd = lcd_get_data(ldev); + + locomo_lcd_off(lcd); + + locomo_lcd_disable_adsync(lcd); + + iio_channel_release(lcd->comadj); + + return 0; +} + +static void locomo_lcd_shutdown(struct platform_device *dev) +{ + struct lcd_device *ldev = platform_get_drvdata(dev); + struct locomo_lcd *lcd = lcd_get_data(ldev); + + locomo_lcd_off(lcd); + + locomo_lcd_disable_adsync(lcd); +} + +static struct platform_driver locomo_lcd_driver = { + .driver = { + .name = "locomo-lcd", + .pm = LOCOMOLCD_PM, + }, + .probe = locomo_lcd_probe, + .remove = locomo_lcd_remove, + .shutdown = locomo_lcd_shutdown, +}; + +module_platform_driver(locomo_lcd_driver); + +MODULE_AUTHOR("John Lenz <[email protected]>"); +MODULE_AUTHOR("Pavel Machek <[email protected]>"); +MODULE_DESCRIPTION("LoCoMo LCD driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:locomo-lcd"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
